Hummer H3 Engine Camshaft Position Sensor: A Complete Guide for 2006-2010 Models
Fix stalling, rough idling, and starting issues on your H3 by understanding and choosing the right camshaft position sensor.
- A bad camshaft sensor on an H3 causes stalling, hard starting, and a check engine light (P0340).
- Most H3s have two sensors (intake and exhaust) that are not interchangeable; verify your engine's needs before buying.
- This is a very easy DIY repair, requiring only a 10mm socket and about 15-30 minutes.
- For best results, choose a reputable brand like ACDelco, Delphi, or NGK, as cheap sensors are known to cause issues.
Is Your Hummer H3 Experiencing Engine Problems?
A faulty camshaft position sensor is a common cause of engine trouble in the 2006-2010 Hummer H3. When this sensor starts to fail, it sends incorrect information, or no information at all, to the engine's computer. This can leave you with an engine that runs poorly or won't start at all. Understanding the symptoms and knowing how to choose the right replacement part is key to getting your H3 back on the road.
Symptoms of a Failing Camshaft Position Sensor
If your sensor is going bad, your H3 will let you know. Here are the most common signs:
- Check Engine Light: This is often the first warning. You will likely get a diagnostic trouble code such as P0340 or P0014. 🎬 Watch: Diagnosing a P0014 code and exhaust sensor issues.
- Difficulty Starting: The engine may crank for a long time before it starts, or it may not start at all. Some owners report a strange issue where the truck won't start on the first try but fires up immediately on the second.
- Engine Stalling: The engine may suddenly shut off while you are driving or while idling at a stoplight. This is a serious safety concern.
- Rough Idle and Poor Performance: You may notice your engine idling unevenly, sputtering, or hesitating when you press the gas pedal. A general lack of power during acceleration is also a common symptom.
Important Note for H3 Owners
The inline-5 engine in the 2006-2007 H3 uses two separate camshaft position sensors: one for the intake cam and one for the exhaust cam. They are different parts. However, some 2008-2010 models with the 3.7L engine may only have the exhaust sensor. Always verify your specific vehicle's configuration before ordering.
Choosing the Right Aftermarket Sensor
When it comes to engine sensors, quality matters. While saving money is tempting, a cheap, low-quality sensor can fail quickly or not work correctly out of the box, leading to more frustration. Based on owner feedback and mechanic recommendations, we've grouped the available brands into tiers.
Tier 1: OEM Equivalent & Premium Aftermarket
These brands are known for providing original equipment (OE) parts to manufacturers or are highly regarded for their quality and reliability. They are the safest bet for a long-lasting repair.
- ACDelco: As the original equipment supplier for GM, this is the benchmark for quality and fit. Choosing ACDelco is the closest you can get to buying the part from a Hummer dealership.
- Delphi: Another top-tier manufacturer that produces high-quality sensors with a strong reputation for reliability, often supplying parts directly to automakers.
- NGK / NTK: While famous for spark plugs, NGK's sensor division (NTK) is a trusted OE supplier known for excellent electronics.
Tier 2: Trusted Aftermarket Brands
These brands offer a good balance of price and quality. They are a solid choice for most DIY repairs.
- Hitachi: A well-respected Japanese manufacturer that produces many OE electronic components.
- Standard Motor Products (SMP): A long-standing aftermarket company that offers reliable parts, often with different quality levels to choose from.
- Dorman: Known for providing a wide range of aftermarket solutions, Dorman sensors are a popular and generally reliable choice that meets OE form and function.
- Beck Arnley: Focuses on sourcing parts that match the original equipment for import and domestic vehicles, often packaging OE-quality components.
Tier 3: Economy Brands
These brands offer the most budget-friendly options. They can be a viable choice for a quick fix or if the budget is the primary concern, but be aware that quality and longevity can be inconsistent.
- Global Parts, Holstein, Motorad, Prenco, Skyward, Spectra, True Tech, Walker Products
Pro Tip: Don't Just Replace the Part
While the sensor itself is the most common failure point for a P0340 code, the issue can sometimes be in the wiring harness or connector. Before installing your new sensor, inspect the connector for any corrosion, damage, or loose pins. Ensure it clicks securely into place.
Cost of Replacing the Camshaft Position Sensor
| Part Type | Estimated Cost |
|---|---|
| New Aftermarket Sensor | $21 - $80 |
| New OEM (ACDelco) Sensor | $35 - $65 |
| Shop Labor | $50 - $125 |
Frequently Asked Questions
Where is the camshaft position sensor located on my H3?
On the 3.5L and 3.7L inline-5 engines, the intake sensor is on the front of the engine on the passenger side. The exhaust sensor is located on the top of the engine cover, near the oil fill cap. Both are held in by a single 10mm bolt, making them very accessible.
🎬 See this video for the exact sensor and crankshaft locations.Can I replace this sensor myself?
Yes, this is a great DIY job for beginners. You only need a 10mm socket and a ratchet. The entire process for one sensor can take as little as 15 minutes. Just be gentle with the plastic electrical connector and its locking tab.
🎬 Follow this step-by-step walkthrough to replace your sensors.Is there a recall for the camshaft position sensor on the Hummer H3?
No, there are no active recalls from GM or NHTSA specifically for the camshaft position sensors on the 2006-2010 Hummer H3.
Should I replace both sensors at the same time?
If your H3 has two sensors and one has failed, the other is likely the same age and has been exposed to the same conditions. While not strictly necessary, replacing them in pairs can be good preventative maintenance and may save you from having to do the job again in the near future.
Helpful Videos
Technical Specifications
OEM Part Numbers: 12588992 12674703 213-1617 213-1557
The 2006-2007 Hummer H3 with the 3.5L/3.7L I5 engine typically uses two sensors: one for the intake camshaft and one for the exhaust camshaft. Some 2008-2010 3.7L models only use a single exhaust sensor. The V8 engine has a different configuration. Always confirm the required sensor by position (intake or exhaust).
We Have This Part in Stock
The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.
- Hummer H3:
- 🎬 Helpful Videos
- 🛍️ Shop This Part
- Is Your Hummer H3 Experiencing Engine Problems?
- Symptoms of a Failing Camshaft Position Sensor
- Important Note for H3 Owners
- Choosing the Right Aftermarket Sensor
- Tier 1: OEM Equivalent & Premium Aftermarket
- Tier 2: Trusted Aftermarket Brands
- Tier 3: Economy Brands
- Pro Tip: Don't Just Replace the Part
- Cost of Replacing the Camshaft Position Sensor
- Frequently Asked Questions
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